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Finding the Fourth Proportional to 203,800.66, 305,540.20 and 128,762.66

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Solution

The fourth proportional to 203,800.66, 305,540.20 and 128,762.66 is: 193,042.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,800.66 : 305,540.20 = 128,762.66 : x
  2. Step 2: Convert to fraction form
    203,800.66/305,540.20 = 128,762.66/x
  3. Step 3: Cross multiply
    203,800.66x = 305,540.20 × 128,762.66
  4. Step 4: Simplify right side
    203,800.66x = 39,342,169,813.74
  5. Step 5: Solve for x
    x = 39,342,169,813.74/203,800.66
  6. Step 6: Final answer
    x = 193,042.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.